Using Bitcoin to purchase virtual currency at a sweepstakes casino is typically straightforward. First, ensure the casino accepts Bitcoin as a payment method. Navigate to the cashier or banking section, select Bitcoin, and follow the instructions to generate a payment address or QR code. Use your Bitcoin wallet to transfer the necessary funds to the provided address. Once the transaction is confirmed, the virtual currency should appear in your account. Ensure you check for any transaction fees or special instructions provided by the casino.